I agree with your view of how her computer skills were represented. Normally hackers are shown to have almost superhuman abilities that defy logic. Not the case here. And written in a way that the writer didn't brush over it, but explained it in enough detail to be passable.

I read briefly into Larrson's story. It was fascinating, particularly how he died after writing and submitting, but before they were published. Perhaps burned himself out? Well, he wrote some masterpieces none-the-less. Pity he couldn't live to enjoy their success.

There are more after the three by another writer. I haven't read them, and not sure that I will.